Good quality item;Attractive design;Great party accessory;Easy party planning solution;A great party planning solution for those special events.These balloons are manufactured using foil and polyester materials. Balloons made out of these types of material aren’t porous, they’re airtight—meaning gas isn’t able to escape through the material itself. Helium might be able to escape through the neck seal, but if it’s sealed tightly enough, this tends not to be a problem.It's the best from karakeeb.